US 12,350,359 B2
Dyeing composition comprising direct dyes
Bernd Nöcker, Darmstadt (DE); Qi Uellner, Darmstadt (DE); Fariba Ghiasi, Darmstadt (DE); Steven Breakspear, Darmstadt (DE); and Peter Bauer, Darmstadt (DE)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 18/554,694
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Apr. 26, 2022, PCT No. PCT/EP2022/061031
§ 371(c)(1), (2) Date Oct. 10, 2023,
PCT Pub. No. WO2022/229172, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 21170395 (EP), filed on Apr. 26, 2021.
Prior Publication US 2024/0207158 A1, Jun. 27, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. A61Q 5/10 (2006.01); A61K 8/49 (2006.01); A61Q 5/06 (2006.01)
CPC A61K 8/4953 (2013.01) [A61Q 5/065 (2013.01); A61K 2800/4322 (2013.01); A61K 2800/88 (2013.01)] 19 Claims
 
1. A dyeing composition for keratin fibers, comprising:
a) one or more alkalizing agents;
b) one or more direct dyes; and
c) one or more compounds selected from the following groups:

OG Complex Work Unit Chemistry
 wherein R1, R2, and R3 are independently selected from H and CH3, and
2) One or more imidazolidin-2,4-diones and salts thereof,
wherein the one or more direct dyes is selected from the group consisting of HC Blue 18, HC Red 18, HC Yellow 16, Disperse Black 9, Acid Yellow 1, 2-amino-6-chloro-4-nitrophenol, and salts thereof and mixtures thereof, and
wherein a total concentration of the one or more alkalizing agents is in a range of 0.5% to 40% by weight, calculated to the total weight of the dyeing composition.